Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 15222

What do you mean by the term transient?

Ericsson,

5 11201

What are the two ways you can synchronize a block of code?

Ericsson,

5 13835

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 10987

How can you sort dates?

TCS,

2 9166

Why to give the file name same as the public class name in java?

3 7007

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4820

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 7389

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 8677

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 6721

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 3438

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 8709

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 13400

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 10530

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 11454

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Un-Answered Questions { Core Java }

What does int argc char * argv [] mean?

943

How to perform merge sort in java?

1004

What is a class component?

1124

What is set in java?

989

Can a class be defined inside an interface?

987

Differences between C and Java?

1129

What is a lock or purpose of locks in java?

978

What is sizeof in java?

1058

What is a finally block?

935

What is api in java?

939

What is backdrop?

1022

Explain inner classes ?

1082

What is a modifier?

1439

Does treeset use compareto?

914

What does string intern() method do?

1051

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